Shut-out cylinder



Nov. 22, 1927.

N; B. HURD SHUT-OUT CYLINDER Filed May 20. 192'? INVENTOR. hm/mm 55. gfi/wwl wa a a g ATTORNEYS.

Patented Nov. 22}, 192?.

irons/inn B. noun, ornnw BRITAIN; ooriuncrrcn'r, assronon To THE narnnrcen nennwenn conronerron, or new entrain, connncrrcur, neotaronarron or connnc'rroucc.

I enomous Application filed any as,

This invention relates to improvements in cylinder locks, the objectbeing to provide a simple'an'd effective means whereby by the use of a special key the lock'may be so set that it cannot be operated by theordinary key. f In the accompanying drawings-y 1 is a side elevation, partlybroken away and in sectionysho'wing the .ordinaryfl key in position; a I 1 Fig. 2 is a cross sectionofthe plugin the. plane of the tumblers shown inFig. 1;- i

Fig. 3 is a View similar toFig. 1 showing the special keyin place; 1 I y 3 Q Fig. l isa cross section of the plugon the plane of the tumbler appearing inFig. 3; V

Fig. 5 is a sidevie'wof the cylir der -partly broken away showing the'parts in position to prevent operation by the ordinary keya 4 Fig. 6 is a section showing the parts in position to prevent operation by the ord1- nary key. v y 1 represents the inain body of'the cylinder. 2 is'the keyplug rotatable therein. 3 is the conventional roll-back secured to the rear end of the plug 2S0 that when the plug is rotated the rolleback willbe actuated. 4 represents what )1 will call the ordinary.

key. Under normal conditions it ,is desirable that the lock shall be operable by this key and when so operable said key may be pushed fully into place as'indicated at F 1 so that it will operate all of the tumblers. Que of the tumblers and its cooperating follower means is so constructed that it will operate at certain times as a shut out? means to prevent the fullinsertion of the ordinary key igand this particular'tumbler and its follower isshown in the several views, in which 6 represents the innermost pin tumbler of series of otherwiseordinary pin tumblers. The-follower for this tumbler 6 comprises the two pieces and 8 9 is the usual follower spring. In the plug is a circumferential groove in the Zone of the pin tumbler 6 and slightly wider than the tumbler hole. The depth of tliisgroove i is equal to the thicknessof the follower seotion 8. Located in this groove is a flat ring or band which is preferably madeup of two sections 1O11 the outer surface of. said ring being flush with the circumferential wall of the plug when thering is, in place." l i hen either key is in operative position in the plug, it will be noted that the back edge nary key 4. l H

Now, assuming it isdesired to operate the V from being operated by thejkey CYLINDER.

927. serial at. 192351.

portion, and to give clearance therefonl provide a recess 12 in the ring sectionll of greater length than the thickness of the key so that if itwere not for the tumblers the plug could turn on the ring 2 to a limited ex: tent. In the ring section 10 I provide apin passage for the tumbler as seen in'Fig. 2. Whenthe. key l is in place, itwill lift the tumbler'o so that-'it'will move the lower section 8 up to a point just outside of the sleeve section 10. At s'uch a time, itiuay be as- 51111186. that the key will otherwisedift the other plungers to the position wherefthe plugis free. Thus, the key inlay then be turned to in turn rotate the lug and move the roll-back 3. I have thus described the normal. operation of the lock with the. ordi shut out mechanism to prevent the lock :--lo do this; usewhat I will ter'in'a special key 142. shown in Fig. 3, wherein it will be seen that the forward endof this keyl isfout nets-es [ere-1e same extends out into. theg-rooved back so that when it is pushedinto place it j will not lift the tumbler (iythusleaving the follower section l in the hole in the sleeve se'ctionlO. Since the special key l lwill'operate the other tumblers to free the plug, it followsthat when the key '14 is in place, as shown in Fig. 3, the plug may be turned. Cllurning the plug; and'thel sleeve clockwise as viewed in 4: willmove the sleeve sections 10-ll to the position indicated "in F ig. 6. Turning the key back again to the position shown in F ig. 3 will restore the plug to the position where the key may bewithdrawn; but thiscounterclockwise movement of the plug still leaves the sleeve 10 with the fol lower section 8 in the positionindicated in F ig. 6 so that the tumbler 6; when the key 14 is removed, will stand insideof a solid part. of the sleeve section 10. Thus, if an attempt is made to insertthe key 41- into the cylinder as shown'iu Fig. 5, it will abut against the lower endof the tumbler 6 (or the-ball bearing nowjcomn only usedat thelower end of such tumblers) and will be thereby locked from full insertion, andconsequently it can-. not unlock the plug so that it maybe turned.

Ordinarily, mere friction will servefto' hold the sleeve sections 1'0-'-11 in their two opera tive positions. To restore the parts to a posil on . 3 and then turns it in a counter-clockwise di- -1eClllOli, Wl1iCll will return the ring and follower section 8 to a position in line'with the regular follower section 7, where it will remain while the owner of the special key 14 turns the plug back to the position w iere said key may be withdrawn. This will leav the plug 6 and follower sections 7-8 in line, as shown inFig. 1, so'that the lock may then be operated by the ordinary key 4'.

It will be noted that the circuniferentially mounted and movable ring section 10 operatesas 'a shield when it stands in the position indicated in Figs. 5 and 6, will then block tumbler 6 in the key plug when the slot stands inthenormal'position, that is to say, i

in a position in which the key or keys are msertible or removable. 7

While I have shown the invention in a pre- 7 ferred form, it should be understood that I intend it'to cover such modifications as may be legitimately regarded as within the spirit of he invention and the scope of the following claims. 1

\Vhat I claim is:

1. In a cylinder look, a cylinder, aplug, a pin tumbler iii-the plug, a two-part follower coacting with said tumbler, a shield carried by said plug and.ci'rcumferentially movable thereon, one of the parts of said follower being of a thickness not in excess of the thick- 7 ness of the shield, said shield being movable on said plug by the operation of one key to ove'rstand tliepin tumbler in the plug when "the key slot therein stands in a key-insertible position to thereby prevent the operation of that pin tumbler by a different key.

2. In a cylinder look, a cylinder, a plug, a pin tumbler in the plug, a follower in the cylinder, a shield between the plug and the cylinder and operable by the movement of the plug by the use of a special key to cause said shield to overstand the pin tumbler when the key slot in the plug stands in the normal position, to prevent at such time the operation of that pin tumbler by the key designed to normally operate said lock.

3. In a cylinder lock, a cylinder, a plug, a follower in the cylinder, a pin tumbler in the plug, a shield located between the plug and said cylinder and movable by the use of a special key to a position where it will overstand the pin in the plug when the latter is in the normal position, to prevent the full insertion of a key ordinarily used to operate said lock.

4;. In a cylinder lock, :1 cylinder. a plug. a follower in the cylinder, a. pin tumbler in the plug, a shield located between the plug and'said cylinder and movable by the useOf V a special key to aposition where it will overst-an'd the pin in the plug when the latter is in the normal position, to prevent the full insertion of a key ordinarily used to operate said lock, said shield being mou'nted in a recess on the plug and circumfereiitially movable therein.

5. In a cylinder look, a cylinder, a plug, a follower in the cylinder, a pin tumbler in the plug, a shield located between the plug and said cylinder and movable by the use of a special key to a position where it will overstand the pin in the plug when the latter is in the normal position. to prevent the full insertion of a key ordinarily used to operate said lock, said follower comprising two parts, one part being of a thickness not in excess of the thickness of the shield.

6. In a pin tumbler lock, a cylinder having a follower passage therein and a follower in said passage, a rotatable plug in said cylinder, said plug having a longitudinal key passage and a transverse pin passage registering with the follower passage ill) in the cylinder at certain times, a pin in said passage for operating the follower when said pin is lifted by a key, a shield mounted on said plug for circumferential movement thereon, said shield having a passage for the follower and pin tumbler, said shield being movable to a position where a solid portion thereof overstands the pin passage when the plug is in, normal position, to thereby prevent the full insertion of the key ordinarily designed to operate saidpin tumbler. i

7. In a pin tumbler lock, a cylinder having a follower passage therein and a fol lower in said passage, a rotatable plug in said cylinder, said plug having a longitu' dinal key passage and a transverse pin passage registering with the follower passage in the cylinder at certain times, a pin in said passage for operating the follower when said pin is lifted by a key, a shield mounted on said plug for circumferential movement thereon, said shield'having a passage for the follower and pin ,tmnblensaid shield being movable to a position where a solid portion thereof overstands the pin passage when the plug is in normal position, to thereby prevent the full insertion of the key ordinarily designed to operate said pin tinnbler, said shield comprising a ring surrounding the plug, said ring'being recessed to form two spaced shoulders to be engaged by a. portion of a key standing in the key slot of the plug, whereby by the rotationof the plug in one direction or the other the shield will be moved on the-oneliand to its non-shielding position and on, the other hand to its shielding position. 

